Prevent redundant alias update caused by path alias language fallback.

I had a look at the linked issues and tried some patches but they didn't stop this issue occurring. I also downloaded the latest version of this module and and it's still occurring. Where was this fixed? (Using core 10.2)

Seeing as this is still occurring I re-opened and opened a MR. Added code in the AliasStorageHelper class rather than PathautoGenerator

Hmmm both my MR and patch #10 will result in duplicate aliases being created every time you save a node if you do something like this in hook_pathauto_alias_alter

if ($context['language'] === \Drupal::languageManager()
      ->getDefaultLanguage()
      ->getId()) {
      $context['language'] = LanguageInterface::LANGCODE_NOT_SPECIFIED;
    }

Updated my fork to handle duplicate aliases caused by altering path alias languages.

Also, I feel like this is actually a bug report, because it's impossible to create a new alias in a different language without overriding the fallback alias. The title could probably be updated too but I'll leave that alone for now.